Hobby Electronics Basics

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Mag stripe writer

Hi, all, I'm looking to program a front-end for a project I have coming up. I need to be able to swipe a card, look at...
6 comments posted 21yrs
posted by netsecuredavis
6 comments posted 21yrs posted by netsecuredavis

Transformer current and a NiMH battery pack

A while back I built an adjustable power supply with a 12V 1.2A power supply, a full wave bridge rectifier, and an LM11...
4 comments posted 21yrs
posted by computer_prog
4 comments posted 21yrs posted by computer_prog

interface real world to pc question?

Hi Any help on this would be appreciated. I want to read in an analogue voltage from the 'world' into my computer, proc...
6 comments posted 21yrs
posted by rlayberry
6 comments posted 21yrs posted by rlayberry

D type Flip Flop

Let me see if I understand this. If I were to take a D Flip Flop and connect the Q' output to the D input, every time t...
3 comments posted 21yrs
posted by 1qazse4
3 comments posted 21yrs posted by 1qazse4

Voice annunciated test box circuitry

Hello I am a repair tech for medical equipment and am needing to make some test boxes for simple location of the number...
20 comments posted 21yrs
posted by mirach9320
20 comments posted 21yrs posted by mirach9320

Current Meter for 12V Solar System

Hello, I'd like to create a current meter for a small solar system that I've built. The system has a couple large deep...
6 comments posted 21yrs
posted by marshall
6 comments posted 21yrs posted by marshall

newbie digital circuit design help!

im interested in small robotics, starting my electrical engineering class next semester - im wondering about microcontr...
3 comments posted 21yrs
posted by edhotchkiss
3 comments posted 21yrs posted by edhotchkiss

Broken Switch on Voltage Converter

I have a voltage regulator that I was using with my 220V printer. The on/off switch on the voltage regulator somehow br...
5 comments posted 21yrs
posted by Searcher7
5 comments posted 21yrs posted by Searcher7

Turning a light on and off with momentary switch

I want a circuit that will turn a light on with the press of a momentary switch and then turn it back off when the mome...
44 comments posted 21yrs
posted by 1qazse4
44 comments posted 21yrs posted by 1qazse4

What does Rail Mean ?

I know that rail tends to be a slang term in electronics, but what does it mean and where does it come from. Im not sure...
15 comments posted 21yrs
posted by Cretian
15 comments posted 21yrs posted by Cretian

What can happen if a Wall Adapter Fails?

For safety reasons, I need to know what are the REALISTIC chances of 120V appearing at the output of a failed basic 12V...
2 comments posted 21yrs
posted by royalmp2001
2 comments posted 21yrs posted by royalmp2001

LM386 Audio Amplifier

I am trying to build an LM386 audio amplifier on a breadboard but am getting "motorboating" oscillations. The layout on...
1 comments posted 21yrs
posted by slave
1 comments posted 21yrs posted by slave

Wireless Heart Rate Monitor

Hi, Does anyone have or is familiar with designing/building a receiver for the Polar Heart Rate Monitor transmitter? Tha...
14 comments posted 21yrs
posted by witczak
14 comments posted 21yrs posted by witczak